Blue wool dyestuff



Patented Sept. 19, 1922.

UNHTED TA-TES mater rarer @FFHC.

HUGO SCHWEITZER, F LEVERK'USEN, NEAR COLOGNE, GERMANY, ASSIGNOR TO FARBENFABRIKEN VORM. FRIEDR. BAYER AND (30-, OF LEVERKUSEN, NEAR,

' COLOGNE-GN-THE-REINE, GERMANY.

. BLUE 'woor. nYEsrurr.

1N0 Drawing.

Application filed August 8, 1921. Serial No. 490,701.

(GRANTED UNDER THE PROVISIONS OF THE ACT OF MARCH 8, 1921, 41 STAT. 14., 1313.)

To all whom it may concern:

Be it known that I, HUGO SoHwnrrzER, citizen of the German Empire, residing at Leverkusen, near Cologne, Germany, have 5 invented new and useful Improvements 1n Blue Wool Dyestuffs (for which I have filed applications in Germany, Feb. 19, 1916, Patent Number 298,432; Austria, Feb. 5, 1917, Patent Number 87 ,334; Switzerland, June 3,

1920, Patent Number 88,562, France, .May 12,1920, Patent Number 515,442; and 1n England, May 6, 1920, Patent Number 164,218), of which the following is a specification.

I have found that new and valuable azodyes can be obtained by combining diazocompounds of 4-nitranilin-2-sulfamids having most probably the following general formula V 7 40 with a bluish and in concentrated sulfuric acid with a red coloration. Upon reductiou with tin and hydrochlorid ac d a paraphenylendiamin derivative having, most probably the formula:

and a 1.2-diamino-8-naphtholsulfonic acid compound are obtained. They dye wool from acid baths even blue shades fast to light and fulling.

In order to illustrate the new process more fully the following example is given, the parts being by weight :-321 parts of 4-nitranilin-2-sulfethylanilid are dissolved in 300 parts of glacial acetic acid and are diazotized with 110 parts of hydrochloric acid and 69 parts of sodium nitrite. The diazo solution is then added to a solution of 239 parts of 2-amino-8-naphthol-6-sulf0nic acid containing a slight excess of hydrochloric acid. lhe dye is salted out, treated with sodium carbonate, filtered off and dried.

It has in affree state most probably the formula:

soluble in concentrated sulfuric acid with a red coloration. Upon treating it with tin and hydrochloric acid it is split up into 1.4- diaminobenzene-2-ethylphenylsulfamid and 1.2-diamino-8-naphthol-6-sulfonic acid. It dyes wool from acid bath navy-blue shades fast to light and fulling. Other of the above mentioned 4-nitranilinsulfamids .can be used, such as 4-nitranilin-2-sulfani1id, 4-nitranilin-2-sulfdiphenylamid, 4-nitranilin-2- sulfmethylanilid or. 4-nitranilin-2-sulfdimethylamid. 1

I claim 1. The herein described new azodyes, which in the form of their dried and pulverized salts with alkali metals are dark powders soluble in water generally with a bluish and in concentrated sulfuric acid with a red coloration; yielding upon reduction with tin and hydrochloric acid a substituted para-phenylenediaminsulfamid and a 1.2-

diamino-8-naphtholsulfonic acid compound; and dyeing wool blue shades fast to light and fulling, substantially as described.

2. The 'herein described new azodye having in a free state most probably the following formula being in the form of its dried and pulverized sodium salt a dark powder soluble in concentrated sulfuric acid with a red coloraethylphenylsulfamid tion; yielding upon reductionwith tin and hydrochloric acid 1.4-diamino-benzene-2- and 1.2-diamino-8- naphthol-G-sulfonic acid; and dyeing wool from acid baths navy-blue shades fast to light and fulling, substantially as described.

In testimony whereof I have hereunto set 7 my hand in thepresence of two subscribing 

